package Java9new.Java9;

import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

public class StringTest {
    public static void main(String[] args) {
        String str = new String();//byte[] value;  底层char  改为byte
        CopyOnWriteArrayList<String> list= new CopyOnWriteArrayList<>();

        list.add("“5");
    }
}
